Power Transfer and Multi-Control Mode of a Distribution Network Based on a Flexible Interconnected Device

With large-scale access to distributed power sources in medium and low-voltage distribution networks, the problem of insufficient local consumption capacity and source-charge mismatch in medium- and low-voltage distribution stations has become increasingly prominent. Power transfer and control strategies based on a flexible interconnection device (FID) for a distribution area near a particular geographical location are studied in this paper. A two-terminal distribution network model with tidal current complementarity is built based on a back-to-back (B2B) FID. A multi-mode operation method is proposed for power conversion under normal operation and power recovery under failure of one side, and a smooth switching strategy based on multiple control modes is also presented. Using this smooth switching method, an inverter controller is designed to form an integrated control unit. Finally, a simulation model of the distribution area with FID is built, and simulations of power transfer and mode switching under different working conditions are carried out. The correctness and effectiveness of the proposed method are verified.